CRA AGENT

Name: CRA AGENT
Author: giupy997

by giupy997version 0.0.11i★ –iRuns on your computer

Registry nameio.github.giupy997/cra-agent

Install

Overview

Description from the maker (original English)

Lets an agent pay for x402 APIs in USDC on Arc, under a spending policy it cannot change.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other
You need to fill in: CRA_NETWORK, CRA_KEY_FILE

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: CRA_NETWORK, CRA_KEY_FILE, CRA_POLICY, CRA_RPC_URL, DATABASE_URL

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "cra-agent": {
      "command": "npx",
      "args": [
        "-y",
        "@cra-agent/mcp"
      ],
      "env": {
        "CRA_NETWORK": "your-value",
        "CRA_KEY_FILE": "your-value",
        "CRA_POLICY": "your-value",
        "CRA_RPC_URL": "your-value",
        "DATABASE_URL": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add cra-agent --env CRA_NETWORK=your-value --env CRA_KEY_FILE=your-value --env CRA_POLICY=your-value --env CRA_RPC_URL=your-value --env DATABASE_URL=your-value -- npx -y @cra-agent/mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "cra-agent": {
      "command": "npx",
      "args": [
        "-y",
        "@cra-agent/mcp"
      ],
      "env": {
        "CRA_NETWORK": "your-value",
        "CRA_KEY_FILE": "your-value",
        "CRA_POLICY": "your-value",
        "CRA_RPC_URL": "your-value",
        "DATABASE_URL": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "cra-agent": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cra-agent/mcp"
      ],
      "env": {
        "CRA_NETWORK": "your-value",
        "CRA_KEY_FILE": "your-value",
        "CRA_POLICY": "your-value",
        "CRA_RPC_URL": "your-value",
        "DATABASE_URL": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

CRA_NETWORK required env
arc (mainnet) or arcTestnet
CRA_KEY_FILE required env
Path to a chmod 600 file holding the agent's private key. Never put the key in a prompt.
CRA_POLICY env
Spending limits, e.g. daily=5,per_seller=0.5,per_payment=0.05
CRA_RPC_URL env
Optional RPC endpoints, comma separated, in priority order
DATABASE_URL env
Optional Postgres for the ledger; in memory without it

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account giupy997, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32683 servers in this category
Published to the registry more recently than 48% of the other 32683 servers in this category
Basic checks equal to or better than 100% of the other 32683 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is CRA AGENT safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: CRA_NETWORK, CRA_KEY_FILE

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.0.11) reached the registry 44 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, MCP Server Autocad Lisp Helper

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

@cra-agent/mcp

An MCP server that lets an AI agent pay for an API call. The agent calls one tool, the rail reads the x402 price, checks a spending policy, pays in USDC on Arc through Circle Gateway with no gas for the buyer, and keeps the receipt.

The model never sees the key, and it cannot raise its own limit: both are read from the environment before the conversation starts.

Install

npm i -g @cra-agent/mcp

Set it up in one command

cra-agent init --client claude-desktop

Creates the agent's key in ~/.cra-agent/agent.key (readable only by you, never overwritten), checks the limits, writes the entry into the client's config file with a copy of the old one, and prints the address to fund. --client is claude-desktop, cursor, claude-code or terminal; --policy, --network, --key-file and --dry-run do what they say. CRA Factory writes the command for you from four questions.

Or by hand, from any MCP client

{ "mcpServers": { "cra-agent": {

"command": "cra-agent-mcp", "env": { "CRA_NETWORK": "arc", "CRA_KEY_FILE": "/path/to/agent.key", "CRA_POLICY": "daily=5,per_seller=0.5,per_payment=0.05" } } } }

CRA_KEY_FILE points at a file holding the private key, chmod 600. Never put a key in a prompt.

Tools

Tool	What it does
`arc_search`	Finds what can be bought on Arc from a few words ("bitcoin price", "web search"): CRA AGENT's own data, the CRA market, and the endpoints Circle's x402 catalogue lists as payable on Arc (Exa, Goldsky, BlockRun and others). Each result: the method and the URL with example parameters, where each parameter goes (query, path or JSON body), the price, the seller, who listed it, and whether your policy allows paying it now. Free.
`arc_quote`	Reads the price of a URL and says whether the policy would allow it. Pays nothing. For a POST, pass the body the payment will carry: some sellers check it before they name a price.
`arc_pay`	Pays for the URL and returns the response with a receipt. With `lightning: true` it pays in bitcoin over Lightning when the seller's 402 offers it (x402 exact on lnbtc), from the wallet in `CRA_NWC_PAY_FILE`, under the same limits in dollars. Limits are checked on what the 402 asks at pay time, before anything is signed. `maxUsdc` adds a ceiling for that one call: pass the price `arc_search` listed, and a seller who raised it since is refused even inside your limits.
`arc_balance`	Wallet and Circle Gateway balances.
`arc_deposit`	Moves wallet USDC into the Gateway balance. Needed once before the first payment.
`arc_ledger`	Every attempt: quoted, rejected, signed, settled, failed.
`arc_proof`	Matches settled payments to the on-chain transfer that carried them.
`arc_verify_receipt`	Checks a signed receipt from another agent: who signed it, and whether the payment fitted the limits it states.
`arc_policy`	Shows the limits in force.
`arc_job_*`	ERC-8183 escrow jobs. Testnet only until the contract is deployed on Arc mainnet.

An agent that pays for its own thinking

cra-agent think " " runs a small autonomous agent whose brain is a pay-per-call LLM on Arc: BlockRun's chat completions, found in the bazaar, Claude Haiku 4.5 by default. Every thought is a paid call, and so is every tool the brain asks for: it searches the bazaar for free, then buys what it needs at the listed price. There is no API key anywhere, only the agent's wallet. The session budget (--budget, default $0.10) and the spending policy cover thinking and tools alike, a thought is capped with --ceiling (default $0.01), and the brain can only buy a URL that one of its searches returned. It prints each step with its cost and ends with the bill: so much for thinking, so much for tools. A short task costs a few cents: the run on cra-agent.tech/think that found when Arc mainnet went live and who validates it cost $0.023648, four thoughts and one web search from Exa.

It also knows a few free public APIs, called without paying and shown as such: DexScreener's pairs, boosted tokens and new token profiles, digested to what answers questions (pairs by 24-hour volume). --tools keeps it to a list of URL prefixes: anything else is never shown to it, so never bought.

With --record and a DATABASE_URL, the run is kept in Postgres as it happens, step by step, which is how the page shows it live and replays it after. --questions picks the question when none is given, which is how our server runs it on a timer: the file combines templates (What is the price of {coin} right now?) with lists (@coin = bitcoin (BTC) | ether (ETH)), and a recorded run never repeats one of the last hundred questions.

The same agent can be hired by anyone, over x402 upto: GET https://api.cra-agent.tech/v1/upto/think?task=… asks you to sign for up to $0.10 and charges what the run spent plus $0.005. arc_pay and cra-agent pay pay routes like this one: your policy is checked against the ceiling, since all of it could be taken, and your ledger keeps what was. The default policy allows $0.05 a payment, so give this one more with per_payment=0.10.

Fund the agent from Base or Solana

Paying on Arc takes USDC in Circle Gateway on Arc, and most agents hold theirs on Base or Solana. One command brings it over and deposits it:

cra-agent fund 5 --from base                                    # from this agent's own wallet on Base, same key and address

cra-agent fund 5 --from solana --solana-key-file ~/sol.json # from a Solana wallet: our hex seed or solana-keygen's JSON cra-agent fund 5 --from base --dry-run # everything checked, nothing signed

It asks Eco for a route, and checks the quote before signing anything, from the transaction's own calldata: a CCTP burn of exactly that amount to Arc's domain, minting to this agent, a fee under the cap (--max-fee, default 0.5% or $0.01), the refund to the same wallet. From Base, the vault the USDC goes into must be the one Eco's Portal derives for that intent. It then waits for the USDC on Arc, usually seconds, and deposits it into Gateway, leaving $0.01 in the wallet for Arc's gas (--keep, or --no-deposit to keep it all in the wallet). From Base the wallet needs a little ETH for two transactions, about a cent; from Solana, a little SOL. The model has no tool for this: moving money between chains is the owner's call, from a terminal.

The same thing from a terminal

cra-agent find bitcoin price    # what is for sale on Arc; needs no key (in a browser: cra-agent.tech/bazaar)

cra-agent balance cra-agent quote https://api.cra-agent.tech/v1/paid/rpc/health cra-agent quote https://api.exa.ai/search --body '{"query":"x402 on Arc"}' # the price of a POST, with its body cra-agent fund 5 --from base # USDC from Base to this agent on Arc, into Gateway cra-agent deposit 1 cra-agent withdraw 1 # Gateway balance back to the wallet; how a seller collects cra-agent pay https://api.cra-agent.tech/v1/paid/rpc/health cra-agent pay https://api.exa.ai/search 0.007 --body '{"query":"x402 on Arc"}' # a POST, refused above the listed price cra-agent think "What is x402, in two sentences?" --budget 0.10 # an agent that pays for its own thinking cra-agent proof cra-agent verify receipt.json # needs no key and no network cra-agent pq-key ~/.cra-agent/pq.key # a post-quantum key for receipts; prints only its public half cra-agent verify receipt.json --require-pq --on-arc # the second signature too, and Arc's own verdict on it

Every receipt carries the limits the payment passed under and is signed with the agent's key, so someone who was not there can check it. The signature proves the agent issued the statement and nobody changed it; the settlement on chain is the independent half.

Environment

Variable	Meaning
`CRA_NETWORK`	`arc` (mainnet) or `arcTestnet`. Default `arcTestnet`.
`CRA_KEY_FILE` / `CRA_PRIVATE_KEY`	The agent's key. Prefer the file.
`CRA_POLICY`	`daily=5,per_seller=0.5,per_payment=0.05,rate=120/60s,allow=a.com\	b.com,deny=c.com`
`CRA_RPC_URL`	Optional, one or several separated by commas, in priority order. Tried before the public Arc endpoints.
`CRA_RPC_STRICT`	`1` to never fall back to a public endpoint.
`CRA_BASE_RPC_URL` / `SOLANA_RPC_URL`	Optional, for `fund`: the Base and Solana endpoints. Public ones by default.
`DATABASE_URL`	Optional Postgres for the ledger. Without it the ledger lives in memory.
`CRA_PQ_KEY_FILE`	Optional, the file `cra-agent pq-key` made. Every receipt is then signed a second time with SLH-DSA-SHA2-128s, the post-quantum scheme Arc verifies on chain. It covers the receipt, not the payment, and adds about a second to each one.

Two things worth knowing. A payment is settled only after the seller's handler succeeds, so a failing endpoint costs nothing: https://api.cra-agent.tech/v1/paid/selftest/fail always answers 500 so you can check. And identity=required pays only sellers with an ERC-8004 identity on Arc: the address that gets paid must own an agent in the registry, or be the wallet an agent declared for payments. It proves an identity exists, not that the seller is honest; registering costs only gas.

Part of CRA AGENT

Payments for AI agents on Arc, Circle's USDC-native L1. Site: cra-agent.tech · Source: github.com/giupy997/arcagentx402 · MIT

CRA AGENT

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

MCP Server Autocad Lisp Helper

README from the maker

@cra-agent/mcp

Install

Set it up in one command

Or by hand, from any MCP client

Tools

An agent that pays for its own thinking

Fund the agent from Base or Solana

The same thing from a terminal

Environment

Part of CRA AGENT